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Thread: Spark plugs
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02-11-2010, 07:40 AM #1
Spark plugs
I have an 02 WS6 and going to change spark plugs every thing is stock wanted to ask would you go with stock or a hotter plug
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02-11-2010, 08:07 AM #2
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pewter- 99 trans am
ac delco irridium....ftw
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02-11-2010, 08:09 AM #3
NGK TR55 plugs gapped at .054".
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02-11-2010, 08:12 AM #4
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02-11-2010, 09:03 AM #5
^^^ +1
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02-11-2010, 09:13 AM #6
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02-11-2010, 09:15 AM #7
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02-11-2010, 09:22 AM #8
They're a 100k plug I pulled the originals out @ 80k and they looked like new (aside from discoloring from use). Replaced with same set and then a set for the TDC. Changing the plugs on a TDC rivals the f-bod LS1 in difficulty... I did'nt want to have to change them alot..
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02-11-2010, 09:27 AM #9
I agree -- my stock plugs looked great after 73,000 miles. I still went with the TR55's as I will never leave a plug in a motor for that long irrespective of its intended life (we purchased the car with 71,000 miles on it). The plugs aren't that bad to do if you remove the coil packs and go get the infamous number 8 from beneath the car.
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02-11-2010, 09:31 AM #10
they're no easier on my 6er f-bod either lol, but the TDC? huh you'll either be trying to lean the motor, (TDC can't be tilted and pinned easily no dog bone loop for pinning the engine) or get out the tool sets cuz you'll be pulling the upper intake.. Or pulling off the cowl weather strip and using 90 feet of extensions to get down into the hemispherical heads where the plugs sit either way you'll be there a while ..
Last edited by Smittro; 02-11-2010 at 09:36 AM.
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02-11-2010, 09:31 AM #11
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02-11-2010, 09:45 AM #12
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02-11-2010, 09:47 AM #13
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02-11-2010, 09:49 AM #14
I agree, I just changed mine to the TR55's. They were not 7$ a piece though! Advance auto parts sold them to me for $2.49 each. BTW, good luck with the rear passenger plug, it's a son of a B$%CH to get to! Also, the owners manual calls for the plugs to be gapped at .060, not .054.
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02-11-2010, 09:55 AM #15
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02-11-2010, 10:03 AM #16
On a side note, along with my statement above. Is labor, prolly also saving 6-8++ hours of labor total on three sets Tr55 changes as opposed to 1-2 hours every 2 or so years.. Unless you don't DD the car.. Even then Tr55's are not cost effective for the minor if any real performance gains. I think most people buy the Tr55 cuz they're cheap..
Last edited by Smittro; 02-11-2010 at 10:06 AM.
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02-11-2010, 11:55 AM #17
ok due to any of my auto part stores not having NGK I bought the AC Delco's but question is what gap should I go with there the iridium plugs
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02-11-2010, 12:04 PM #18
I agree about the AC Delco Iridium plugs, they are excellent.
However, I do not agree with your theory of .54 creating a "hotter" spark.
Spark gap is about the flame front and ignition system voltage. High voltage systems (such as the LS1 coil-over-plug system) can jump larger gaps due to the higher voltage. So by expanding the gap, you get more exposed flame between the electrodes, resulting in better combustion. A gap such as .060 is not possible with conventional distributor ignition systems, because the spark is not strong enough to jump such a large gap.
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02-11-2010, 12:11 PM #19
The difference between the two is .006" -- trivial imo. It was the recommended gap that I went with for the TR55's. As I often say on here, a person can do whatever they want with their own car. If they want to run Royal Purple, a K&N and WeaponX spark plugs, then go for it.
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02-11-2010, 12:15 PM #20
TR55 for the NA cars.
we have them less than $7 ea lol
Thanks,
Mark
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